US 11,739,819 B2
Power transmission device
Hiroki Uehara, Kanagawa (JP); Masumi Fujikawa, Kanagawa (JP); and Toshikazu Oshidari, Kanagawa (JP)
Assigned to Jatco Ltd, Fuji (JP)
Appl. No. 17/428,519
Filed by JATCO LTD, Fuij (JP)
PCT Filed Nov. 12, 2019, PCT No. PCT/JP2019/044220
§ 371(c)(1), (2) Date Aug. 4, 2021,
PCT Pub. No. WO2020/161977, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 2019-022130 (JP), filed on Feb. 8, 2019.
Prior Publication US 2022/0128140 A1, Apr. 28, 2022
Int. Cl. F16H 37/08 (2006.01); B60K 1/00 (2006.01); H02K 7/00 (2006.01); H02K 7/116 (2006.01)
CPC F16H 37/082 (2013.01) [B60K 1/00 (2013.01); H02K 7/006 (2013.01); H02K 7/116 (2013.01); B60K 2001/001 (2013.01)] 10 Claims
OG exemplary drawing
 
8. A power transmission device comprising:
a motor including a rotor;
a first planetary reduction gear connected downstream of the motor, the first planetary reduction gear including a sun gear and a pinion gear that is a stepless pinion;
a second planetary reduction gear connected downstream of the first planetary reduction gear, the second planetary reduction gear including a sun gear and a pinion gear that is a stepped pinion;
a differential gear connected downstream of the second planetary reduction gear; and
a drive shaft connected downstream of the differential gear, the drive shafts penetrating an inner circumference of the rotor of the motor, an inner circumference of the sun gear of the first planetary reduction gear, and an inner circumference of the sun gear of the second planetary reduction gear,
the first planetary reduction gear including a first linking part,
the second planetary reduction gear including a second linking part that is linked to the first linking part of the first planetary reduction gear, and
a carrier of the second planetary reduction gear including a cylindrical part positioned radially outward of an engaging part between the first linking part and the second linking part.